C# XMLDocument，innerxml 和outerxml 的区别
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XMLDocument, difference between innerxml and outerxml
提问by InfantPro'Aravind'
OuterXml- gets the XML markup representing the current node and all its child nodes.
InnerXml- gets the XML markup representing only the child nodes of the current node.
OuterXml- 获取表示当前节点及其所有子节点的 XML 标记。
InnerXml- 获取仅表示当前节点的子节点的 XML 标记。
But for XMLDocumentdoes it really matter? (result-wise, well I know it doesn't matter, but logically?).
但这XMLDocument真的重要吗？（结果明智，我知道这无关紧要，但在逻辑上？）。
Example:
例子：
XmlDocument doc = new XmlDocument();
doc.LoadXml("<book genre='novel' ISBN='1-861001-57-5'>" +
"<title>Pride And Prejudice</title>" +
"</book>");
string xmlresponse = doc.OuterXml;
string xmlresponse2 = doc.InnerXml;
In simple words, though both xmlresponseand xmlresponse2will be the same in the code above. Should I prefer using OuterXmlor InnerXml?
简单来说，虽然在上面的代码中两者xmlresponse和xmlresponse2将是相同的。我应该更喜欢使用OuterXml还是InnerXml？
采纳答案by Alexei Levenkov
If you are trying to find why they OuterXml and InnerXml are the same for XmlDocument: look at what XmlDocument represents as node - it is parent of whole Xml tree. But by itself it does not have any visual representation - so "Me"+ "content of children" for it is the same as "content of children".
如果您想找出为什么 XmlDocument 的 OuterXml 和 InnerXml 相同：请查看 XmlDocument 表示为节点的内容 - 它是整个 Xml 树的父节点。但它本身没有任何视觉表现——所以“我”+“儿童内容”与“儿童内容”相同。
You can write basic code to walk XmlNode + children and pass XmlDocument to see why it behaves this way:
您可以编写基本代码来遍历 XmlNode + 子项并传递 XmlDocument 以查看其行为方式：
XmlDocument doc = new XmlDocument();
doc.LoadXml("<?xml version='1.0' ?><root><item>test</item></root>");
Action<XmlNode, string> dump=null;
dump = (root, prefix) => {
Console.WriteLine("{0}{1} = {2}", prefix, root.Name, root.Value);
foreach (XmlNode n in root.ChildNodes)
{
dump(n, " " + prefix);
}
};
dump(doc,"");
Output shows that XmlDocument there is nothing in XmlDocument itself that have visual representation and the very first node that have text representation is child of it:
输出显示 XmlDocument XmlDocument 本身没有任何具有视觉表示的内容，并且具有文本表示的第一个节点是它的子节点：
#document =
xml = version="1.0"
root =
item =
#text = test
回答by vCillusion
For case where InnerXml equals the OuterXml the following solution will work out if you wanted the InnerXml:
对于 InnerXml 等于 OuterXml 的情况，如果您想要 InnerXml，以下解决方案将起作用：
// Create a new Xml doc object with root node as "NewRootNode" and
// copy the inner content from old doc object using the LastChild.
XmlDocument doc = new XmlDocument("FileName");
XmlElement newRoot = docNew.CreateElement("NewRootNode");
docNew.AppendChild(newRoot);
// The below line solves the InnerXml equals the OuterXml Problem
newRoot.InnerXml = oldDoc.LastChild.InnerXml;
string xmlText = docNew.OuterXml;
